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本文阐述了防火墙系统及安全策略，重点论述了构建校园网防火墙时所涉及的各种问题， 并给出防火墙系统拓扑结构和设计实例。
This article describes the firewall system and security strategy, focusing on the construction of the campus network firewall problems involved, and gives the firewall system topology and design examples.